Investigating P0442 on Your 2022 Acura TLX
A P0442 code on your 2022 Acura TLX indicates the PCM detected a small leak in the evaporative emission system. The second-generation TLX uses Honda's reliable EVAP engineering, and after two to three years the cause is typically minor.
TLX EVAP System
The 2022 TLX — available with the 2.0L VTEC Turbo or 3.0L twin-turbo V6 (Type S) — uses Honda/Acura's EVAP system with a bypass solenoid valve, canister vent shut valve, and charcoal canister. The PCM monitors pressure to detect leaks of approximately 0.020 inches.
Most Likely Causes
- Gas cap seal wear (40%) — Honda/Acura's primary P0442 cause. The gasket may have minor wear after two to three years.
- EVAP hose connection issue (25%) — Vapor line fittings can loosen from road vibration.
- Bypass solenoid valve issue (15%) — Internal seal degradation in the purge valve, potentially accelerated by turbo engine heat.
- Canister vent shut valve malfunction (10%) — Incomplete sealing during the leak test.
- Charcoal canister fault (10%) — Road debris damage to the underbody canister.
Diagnostic Steps
Replace the gas cap first. If the code persists, an Acura dealer with HDS provides the most thorough EVAP diagnostics. A smoke test pinpoints the leak location.
Repair Costs
- Gas cap: $20–$45
- EVAP hose repair: $80–$240
- Bypass solenoid valve: $120–$290
- Canister vent shut valve: $110–$270
- Charcoal canister: $230–$460
- Smoke test: $90–$160
Warranty
Your 2022 TLX is within Acura's 4-year/50,000-mile basic warranty. The 6-year/70,000-mile powertrain warranty provides additional coverage. Contact your Acura dealer for warranty repair.